Conduit.



H. P. BROWN.

CONDUIT.

APPLICATION men MAR. l. 1911.

Patented Apr. 1, 1919.

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HAROLD P. BROWN, OF NEW YORK, N. Y.

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Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed March 1, 1917. Serial No. 151,737.

To all whom it may concern:

Be it known that I, HAROLD P. BROWN, a citizen of the United States, andresident of the borough of Manhattan, in the city and State of New York,have invented a new and useful Improvement in Conduits, of which thefollowing is a specification.

' My invention relates to conduits and more particularly to conduits foruse in what is known in the art as jetting concrete, viz: directing thecourse of concrete in a plastic state from a mixer to a point near thesurface to which the concrete is to be applied.

The objects in View are to provide a conduit which shall present littlefriction to the moving concrete, which shall be durable, which shallprevent to a great extent loss of heat by radiation, which shall allowfor changing the direction of the conduit at short intervals, and whichmay be quickly and conveniently assembled and moved.

A practical embodiment of my invention is represented in theaccompanying drawings in which,

Figure 1 is a plan View of the meeting ends of two lengths or sectionsof the conduit.

Fig. 2 is a longitudinal section taken in the plane of the line IIII ofFig. 1.

Fig. 3 is a transverse section taken in the plane of the line IIIIII ofFig. 2.

Fig. 4 is a. transverse section taken in the plane of the line IVIV ofFig. 2, and

Fig. 5 is a fragmentary section on an enlarged scale showing the spiralwire within the conduit, the concrete filling between the coils of wirebeing indicated by a dotted line along the inner peripheral surfaces ofthe coils of wire.

A conduit length or section, conveniently fifteen feet in length, this,however, being altogether a matter of choice or expediency, consists ofa pipe 1 of some suitable material, iron or steel for example. Theopposite ends of the pipe 1 are externally screwthreaded as at 2, toreceive a coupling 3, as is usual in connecting pipe lengths.

The interior surface of the pipe 1 has applied thereto an open spiralelement, preferably of tempered spring steel wire 4. The space 5 betweentwo successive coils of the wire, which form in effect slanting annularriffles, is preferably about twice the diameter of the wire in width.The wire is made fast at the opposite ends of the pipe length. Theinterior lining of the pipe is completed by driving through it, eitherbefore or after it is connected up for use, a stream of concrete 1 mixedwith sand and what remains caught between the coils of wire 4, isallowed to set forming a solid body of concrete between the coils ofwire from the interior surface of the pipe to the dotted line 6, flushwith the inner surfaces of the wire 4.

To prevent loss of heat from the concrete during its passage along theinterior of the plpe 1, the latter is provided with a suitable heatinsulating jacket 7 of magnesia, for

example, and to protect this jacket from injury and from water, thejacket 7 is covered with galvanized sheet steel 8 wound to form a closedtube.

. In order that the conduit sections constructed as above may beconveniently handled, they are each provided with a chair near each ofits two ends, the chair consisting, preferably, of a general inverted U-shaped strap of metal 9, the bight of the inverted U-shaped elementhaving a handle 10 engaged therewith and the branches of the saidelement forming legs 11, 12, extending below the section and connectedby a tie bolt 13. e

To connect the several sections without requiring the turning of one toscrew it to another and to leave a freedom of lateral movement of thefree end of a section to change the direction of the conduit to aconsiderable extent, for instance 3%", a special coupling has beenprovided as follows: A male coupling member 14 has one end provided witha screw thread 15 to screw into the ordinary coupling 3 hereinabovereferred to, and near its opposite end it is provided with a peripheralgroove 16. The end of an adjacent conduit section is in like mannerprovided with a male coupling member 17, these male coupling membersbeing made of uniform size and shape and interchangeable. The adjacentends of these members 14 and 17 are allowed a slight clearance to permitchange in direction and are locked in the desired relation to each otherby the female member of the coupling -18, consisting of a sleeve whichreceives the adjacent ends of the members 14 and 17 with a loose slidingfit and is provided with two sets of perforations 19 and 20, to receivea pin or eye bolt 21, the perforations being so located ofl from thecenter of the sleeve, that a pin 21 will pass through two oppositeperforations when a member 14 or 17 is brought into position to make itsgroove 16 register with the perforations. The interior bores of themembers 14 and 17 correspond in diameter with the bore of the lining ofthe conduit section when the l-atteris completed by the cement fillingbetween the wire coils. Any slight opening at the meeting ends of themembers 14, 17, due to placing consecutive sections at an angle to eachother, will be promptly filled by concrete as soon as the conduit is putin use.

This concrete lining acquires a very high polish and the wetcement formson the surface of the concrete lining a layer of moist cement which actsas a lubricant and aids the passage through the pipe of the concrete 'orcementitious material. Hence, with the same inside diameter morematerial may be forced through the conduit in. a given lengthlof timeandunder a given pressure than where-rubber lined hose, such as has beenheretofore used, is employed.

And, furthermore, the wear, which has heretofore madethe use of ironorsteel pipe so expensive, is "avoided, the lining, constructed ashereinabove-setforth,havin a recuperathe spiral wire 4 and the concreteprotection 6 can becarried through to the ends of the male couplings.

' l-Vhat I claim is:

1. A conduit comprising a pipe having a lining formed of coils of a hardmaterial spaced apart and a filling of cementitious material between andsubstantially flush with the interior surface of the coils, the interiorsurface of the coils being exposed a part of a wearing surface.

2. A conduit comprising a pipe havinga lining formed of slanting coilsof hard ma terial spaced apart and a filling of cementitious materialbetween and substantially flush with the interior surface of the coils,the interior surface of the coils being exposed as part of a wearingsurface;

3. A conduit comprising a pipe having a lining formed of spiral wirecoils spaced apart and a filling ofcementitious material between andsubstantially flush with the interior surface of the coils, the interiorsurface of the coils being exposed as part of a wearing surface.

4. A conduit comprising a pipe composed of hard material, said pipehaving a lining formed of coils of hard material spaced apart and afilling of cementitious material between and substantially flush withthe interior surface of the'coils, the interior surface of the coilsbeing exposed as part of a wearing surface. 1

In testimony,-that I claim the foregoing as my invention, I have signedmy name this 15th day of February 1917.

" HAROLD P", BROWN.

Copies-cums patent may be obtained for five cents each, by addressingthe "Commissioner of Patents.

' Washington, D. G. v

